When a disk is removed while an operation is going on
(eg. single/multipart put object, list/multipart list objects etc),
its required to ignore errDiskNotFound error and continue the
operation.
Fixes#1552
Since there is a good amount of overlap, each code has to lock
properly for the operation they are going to perform.
- MakeVol create vols in a routine on all disks, hold locks.
- DeleteVol delete vols in a routine on all disks, hold locks.
- StatVol stat vols in a routine on all disks, hold locks.
Fixes#1588
All transactions happen through this directory inside ".minio/temp".
Adding this allows us to remove any temporary files which were not
committed before.
Fixes#1462Fixes#1444
